linux-kernel - Re: [PATCH] pata_cmd64x: fix overclocking of UDMA0-2 modes

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Message-ID: <4B2E8D09.4060705@garzik.org>
Date:	Sun, 20 Dec 2009 15:46:01 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
CC:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [PATCH] pata_cmd64x: fix overclocking of UDMA0-2 modes

On 12/20/2009 01:22 PM, Bartlomiej Zolnierkiewicz wrote:
>
> adev->dma_mode stores the transfer mode value not UDMA mode number
> so the condition in cmd64x_set_dmamode() is always true and the higher
> UDMA clock is always selected.  This can potentially result in data
> corruption when UDMA33 device is used, when 40-wire cable is used or
> when the error recovery code decides to lower the device speed down.
>
> The issue was introduced in the commit 6a40da0 ("libata cmd64x: whack
> into a shape that looks like the documentation") which goes back to
> kernel 2.6.20.
>
> Cc: stable@...nel.org
> Signed-off-by: Bartlomiej Zolnierkiewicz<bzolnier@...il.com>
> ---
> it is patch #116 in my local working queue but I thought it would
> be nice to get it upstream ahead of other patches..
>
>   drivers/ata/pata_cmd64x.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

applied


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